ops: bump hardhat version in docker hardhat-node

.changeset/weak-walls-cross.md

+---
+'@eth-optimism/hardhat-node': patch
+---
+
+Bump to hardhat@2.9.1

ops/docker/hardhat/hardhat.config.js

 const isForkModeEnabled = !!process.env.FORK_URL
 const forkUrl = process.env.FORK_URL
-const forkStartingBlock = parseInt(process.env.FORK_STARTING_BLOCK) || undefined
-const gasPrice = parseInt(process.env.GAS_PRICE) || 0
+const forkStartingBlock =
+  parseInt(process.env.FORK_STARTING_BLOCK, 10) || undefined
+const gasPrice = parseInt(process.env.GAS_PRICE, 10) || 0
 
 const config = {
   networks: {
     hardhat: {
       gasPrice,
-      initialBaseFeePerGas: 0
+      initialBaseFeePerGas: 0,
     },
   },
   analytics: { enabled: false },

ops/docker/hardhat/package.json

@@ -6,6 +6,6 @@
   },
   "license": "MIT",
   "dependencies": {
-    "hardhat": "^2.7.0"
+    "hardhat": "^2.9.2"
   }
 }